患者男性,85岁。右大腿赘生物1年伴疼痛4个月,于1991年7月20日来我院求诊。患者开始发现右大腿外侧有黄豆大黑红色结节1粒,表面光滑,无痛痒。常用手指按压,搔抓,有时用剪刀剪除,而后结节渐增大呈羊角状。近4个月自感基底部疼痛、夜间加重。体检:营养、发育尚可,各系统检查均正常。皮肤科检查:右膝关节处上方8cm处,有一羊角状肿块,圆锥形,直径3cm高8.5cm,上端向上后方弯曲,质硬,黑褐色, The patient male is 85 years old. Right thigh spawning for 1 year with pain for 4 months, came to our hospital on July 20, 1991. The patient began to find that there was a large red and black nodules on the outside of the right thigh with a smooth surface and no itching. Commonly used finger pressure, scratching, and sometimes cut off with scissors, and then gradually increase the nodule was horn-like. In the past 4 months, I felt pain in the basement and aggravated at night. Physical examination: Nutrition, development is acceptable, and all systems are normal. Dermatological examination: 8cm above the right knee joint, there is a horn-like mass, conical, 3cm in diameter and 8.5cm high, the upper end is curved backwards, hard, dark brown,